The
mammals
that were endemic to Puerto Rico are now all extinct including the
Puerto Rican Plate-toothed Giant Hutia Elasmodontomys obliquus
(AMNH)
and the Puerto Rican Cave Rat Heteropsomys insulans
(PubMed
Central).

Puerto Rico is a self-governing territory of the United
States of America and includes the Puerto Rican
Moist Forests (Wikipedia)
and the Puerto Rican Dry Forests (Wikipedia)
and is part of the Caribbean Islands biodiversity hotspot (CEPF).